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<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <link href="bootstrap/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
    <div class="container">
        <div class="dropdown pull-right">
            <button class="btn btn-default dropdown-toggle" type="button" data-toggle="dropdown">
                下拉菜单
                <span class="caret"></span>
            </button>
            <ul class="dropdown-menu dropdown-menu-right" role="menu" aria-labelledby="dropdownMenu1">
                <!--li role="presentation" class="dropdown-header">大写一到四</li-->
                <li><a href="#" role="menuitem"> 一</a></li>
                <li><a href="#" role="menuitem"> 二</a></li>
                <li><a href="#" role="menuitem"> 三</a></li>
                <li><a href="#" role="menuitem"> 四</a></li>
                <!--li role="presentation" class="dropdown-header">小写一到四</li-->
                <li><a href="#" role="menuitem"> 1</a></li>
                <li><a href="#" role="menuitem"> 2</a></li>
                <li class="disabled"><a href="#" role="menuitem"> 3</a></li>
                <li><a href="#" role="menuitem"> 4</a></li>
            </ul>
        </div>
    </div>



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    <script src="bootstrap/js/bootstrap.min.js"></script>
</body>
</html>